Hi, I noticed this thread and since I work for RealRyder I thought I could be of some help answering your concerns.
I understand that when a new and different product is developed it is often met with skepticism and caution. Let me assure you that our product was developed with safety and durability as our number one priority. Because of this our product has actually been overbuilt and can withstand forces exponentially higher than other indoor bikes. The fact that the bike moves side to side actually relieves stresses on the bike and our wider base and heavier steel frame insures safety when leaning to the side.
I am a large guy (6'6 275) and have often demonstrated the stability of the bike by standing on only one pedal, holding the handlebars, and throwing my weight all the way to the same side as the pedal I am standing on and holding that position and I have never been able to come close to tipping the bike.

Dogmama: I think your spin instructor must have our bike confused with another, because we have never heard of the situation described by your spin instructor. I am sure if a situation like this actually occurred we would be the first people to hear about it. Can you tell me which club this happenned in so that I could contact them? What your instructor described is highly unlikely because even if the shoe/clip/cage dislodged, the rider would still be straddling the seat and it would be virtually impossible to envision a scenario where a pedal breaking would cause someone to fall off the bike, let alone "fly" off the bike.

Tuckervill: The simple act of having to stabilize your body while exercising, does in fact engage your core. When riding the RealRyder it could not even be described as a subtle change from riding your standard spin bike. It is something you will feel immediately. Furthermore, every time I have demonstrated the bike as soon as I incorporate any of the workouts designed to target the core, the person immediately and noticeably feels the effects of the core exercise.

I hope my info helped answer some of the concerns that were voiced here. I will check on this thread and try and answer any follow up questions posted. I would encourage all of you to take the opportunity to try out the RealRyder if the opportunity arises, I think you will come away very impressed. We have received very positive responses from the vast majority of people who have tried the RealRyder, (as evidenced by the RealRyder recently being named the best indoor cycle on the market by an independent reviewer of fitness equipment, 'fitness professor review' whom you can google if you are interested) and I am very confident you would join our ever-growing list of RealRyder fans.

Thanks for taking the time to read my (long) post.

Casey Harrington
RealRyder